Whistle



FIG. 1 is an isometric view of a whistle showing my new design;

FIG. 2 a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof showing my design. 

CLAIM The ornamental design for a whistle, as shown and described. 